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When recovering a MyISAM table the only file that is strictly needed is the data file (tablename.MYD) – the rest of the files (the index file tablename.MYI and tablename.frm) can be recreated from the data file using REPAIR TABLE.
Assume I’m using InnoDB (with the “innodb_file_per_table” setting) instead – what is the minimum set of files needed to recover a database table from file?
As long as you have the data file and the log files then InnoDB will be able to recover. See this page (and containing chapter) on MySQL.com for more. InnoDB recover is quite different to MyISAM in that is more “built-in” as it were.